Timed out while authenticating with server 5-10% of times

[victornikitin]

Sometimes (5-10% of times) I get error "Timed out while authenticating with server" after .connect().

Code

      this.imap.once('ready', () => {
        console.log('ready')
      });
      this.imap.once('error', err => {
        console.log('error')
      });
      this.imap.once('end', () => {
        console.log('end')
      });
      this.imap.once('close', () => {
        console.log('close')
      });
      this.imap.connect();

Log:

[connection] Connected to host
<= '* OK IMAP4 ready'
=> 'A0 CAPABILITY'
<= '* CAPABILITY IMAP4rev1 UIDPLUS IDLE LITERAL+ QUOTA AUTH=PLAIN'
<= 'A0 OK completed'
=> 'A1 LOGIN "myloginhere" "mypasswordhere"'
[connection] Closed

Config

    this.imap = new Imap({
      user: credentials.login,
      password: credentials.password,
      host: credentials.connectionHost,
      port: credentials.connectionPort,
      tls: true,
      tlsOptions: {
        rejectUnauthorized: false,
      },
      keepalive: false,
      connTimeout: 30000,
      authTimeout: 15000,
      debug: console.log
    });

Version: 0.8.19

After couple of seconds another connection try can be ok.

What can be wrong?